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A pair of dice is thrown 4 times. If get...

A pair of dice is thrown 4 times. If getting a total of 9 in a single throw is considered as a success, then the mean and the variance of the number of failures are respectively

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Given
P=probability of getting a total of `9=4/36​=1/9`
​ so,`q= 1−1/9​=8/9`
​ mean=`np=4xx1/9​=4/9`
​ variance=`npq=4xx1/9​xx 8/9​=32/81`​
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